Duplex-stainless-steel-f51

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Duplex stainless steel - F51 / S31803 / S32205/
1.4462 :-UNS S31803 and UNS S32205 are commonly referred to as Duplex 2205
material, whose Duplex name is derived from the mixed micro
structure which contains about equal portions of ferrite and
austenite. Developed more than 70 years ago in Sweden precisely for
the sulfite paper industry where the Duplexs were used to combat
corrosion problems caused by chloride-bearing cooling waters and
other aggressive chemical products. Since then there have been
advancements in the composition such as the deliberate addition of
nitrogen as an alloying agent, which afterwards quickly made Duplex
the workhorse of stainless steels.








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Generally, UNS S31803 has been solely designated to the Duplex
2205 grade. More recently, it has been available complying with the
higher corrosion resistant composition UNS S32205. The only
difference in the UNS numbers is that UNS S32205 contains a higher
nitrogen content which guarantees better corrosion resistance.
Composed of between 21% to 23% chromium, 4.5% to 6.5% nickel, 5% to
3.5% molybdenum, 2% manganese, and 1% silicon, with the balance being
iron. Also found in Duplex Stainless Steel are trace amounts of
carbon, phosphorus, sulfur and nitrogen.Benefits of Duplex
include: good weldability and workability, high resistance to
corrosion fatigue, stress corrosion cracking (especially chloride
stress corrosion cracking), erosion, and high energy absorption.
Other advantages of Duplex are higher heat conductivity and low
thermal expansion compared to austenitic stainless steels, high
strength, good resistance to sulfide stress corrosion, and high
resistance to pitting and crevice to corrosion. Duplex 2205
accounts for over 80% of the total usage of Duplex stainless steels
throughout the world because of its superior workability as well as
corrosion resistance.





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Corresponding Standards:





EN/DIN


1.4462 X2CrNiMoN22.5.3




AFNOR


Z2CND22.05Az




AISI - A182


F51 (329LN) / F60




UNS - ASTM A276


S31803 / S32205




BRANDS


SAF 2205 - SANMAC URANAUS 45N FALC223




SS


2377




BS (WROUGHT)


318S13




BS (CAST)


332C15




EN (10283)


1.45










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Chemical Composition








C


Si


Mn


P


S


Ni


Cr


Mo


N




Min

















4.5


21


2.5


0.08




Max


0.03


1


2


0.03


0.02


6.5


23


3.5


0.2













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